About this calculator

Plan area × pitch multiplier gives the actual surface area you need to cover with shingles or membrane. A 6/12 pitch adds ~12% to the plan area; a 12/12 pitch adds ~41%.

Frequently asked questions

What does the Roof Area from Pitch Calculator do?

Calculate true sloped roof area from the plan footprint and pitch. Plan area × pitch multiplier gives the actual surface area you need to cover with shingles or membrane. A 6/12 pitch adds ~12% to the plan area; a 12/12 pitch adds ~41%.

Is the Roof Area from Pitch Calculator free to use?

Yes. Every calculator on Calcurly.com is free, works in your browser without sign-up, and can be embedded on your own website.

How accurate is the Roof Area from Pitch Calculator?

Results are calculated in real time using industry-standard formulas. Treat the output as a well-informed estimate — always cross-check with local regulations, product datasheets, or a qualified roofing professional before committing to a purchase or a job.

What inputs does the Roof Area from Pitch Calculator need?

Enter values for: Building length (m), Building width (m), Roof pitch (rise/12 run). Sensible defaults are pre-filled where possible so you can start with a single change.

Can I embed the Roof Area from Pitch Calculator on my own website?

Yes — copy the iframe snippet at the bottom of this page, or use the Embed Generator to customise the size. The embedded version stays in sync with the live calculator on Calcurly.com.